Tire attachment.



0. E'. GRAVES. TIRE ATTACHMENT. APPLICATION FILED OCT- 20. 1914.

Patented July 6, 1915.

f Witnesses Z Attorneys.

60 8 is in the form of a triangle.

STATES PATENT OFFICE.

' os'cn. n omvns, or ma wfsjoonsm.

'rnm Armcnnm.

Specification oflctters Pat ent.

Patented July 6, 1915.

Application filed October 1914. Serial No. 867,641.

To all whom it may concern:

Be it known that I, OSCAR E. Gnavns, a citizen of the United States, residin at Yuba, in the county of Richland and tate of Wisconsin, have invented a new and useful Tire Attachment, of which the following is a specification.

The device formin the subject matter of this application is a s ield adapted to be applied to a tire for the purpose of enhancing the hold of the tire on the ground and for preventing a lateral skidding of the tire.

The invention aims specifically to rovide ,a device of the type above describe made 16 up of triangular links, connected to form parallel chains, the chains being interlocked in a novel manner with each other.

It is within the scope of the invention to improve generally and to enhance theutility of devices of that type to which the present invention appertalns.

With the above and other objects in view which will appear as the description proceeds, the invention resides in the combina- 26 tion and arrangement ofparts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within 80 the scope of what is claimed without depart-.

'in from the spirit of the invention.

n the accompanying draw1ng:F1gure 1 is a top plan; Fig. 2 isa cross section on the.

line 2-2 of Fig. 1; Fig. 3 is a perspective 85 view of one of the lin In'the drawings the numeral 1 indicates a tire provided with a'lon 'tudinal groove 2 in its tread portion, de ning longitudinal ribs 3. It is between the ribs 3 and in the groove 2 that the rotector or shield hereinafter described is coated.

The protector or shield compr ses any desired number of separate chains. In the present instance, but not of necessity, four chains are shown, the chains beingdenotedrespectively by the reference characters 4, 5, 6 and 7 in Fig. 1 of the drawings. Each chain is made up of pivotally connected links, and each link denoted by the numeral At the apex 15 of the link 8 is formed a knuckle 9. Upon that edge 10 of the link 8 which is opposite to the apex 15 are disposed knuckles 11 which are spaced apart to receive the B5 knuckle 9 on an adjoining link. Pivot pins 12 or the like pass through the knuckles 11 and 9 and connect the links together. Upon each link 8 may be superposed a triangular pyramid 14. a

Owing tothe fact that the severalchains 4 5, 6 and 7 are made up of the triangular llIlkS above described,there ,is' formed in the lateral edges of each chain, a lurality of re-- entrant angles 16 and a plura ity of project-' ing angles 17. The apices 15 of the links 8 1n the chain 4 all project in. acommon direction, longitudinallymf the shield, sayto the left, as shown in Fig.1. The apices of the links of the chain 5 project to the right,

those of the chain 6 pro ect to the left, and

'those of the chain 7 project to the ri ht.

In this manner, the projecting angles 1 of 7 one chain are received in the rentrant angles 16 of an adjoiningwhain, as clearly shown in Fig. 10f the drawing. Practlcally the entire surface ofthe base of the groove 2 thus iscovered, and the'approachmg, inclined edges .of the-links 8 of the respective chains are brought into close and intimate contact as shown at 18. l

Certain of the slant faces .19 of the pyramids 14 in therespective chainsslope in opposite directions, longitudinally of the shield. The other slant faces 20 of the. (pyramids in all of the chainscoiiperate to efine a zig-z'ag area extended transversely of the protector, as clearlyshown-.in Fig. 1.- The -ppints ofthe pyramids project prominently yond the ribs 3 and owing to the specific arrangement of the parts as shown in- Fig. 1, a tractive and anti-skidding surface of great efliciency is presented. Noting the point at which the reference character 21 is applied in Fig. 1, it will be observed that one knuckle 11 on each link of one chain bears against the corresponding knuckle on the. ad acent chains located side by side and made up respectively of ivotally connected triangular pyramids de ning interengaged reiintrant amaeoe shield.

4. A tire shield embodying a chain made u of triangular yramids one basal angle 0? each pyramid eing connected pivotally with the intermediate portion of one edge 1 of an adjoining pyram1d.-

In testimon that I claim the foregoing as my own, I ave hereto afiixed my slgnature in the presence of two witnesses.

OSCAR E. GRAVES.

Witiressesu Gnomes O. Bronx-meow Sam GMcGAumr. 

